The synchronized seat and back move in harmony with the user to provide continuous comfort. Seat glide adjustment moves the seat cushion forward or back to adapt to upper leg length. Waterfall seat edge promotes better leg circulation. Height- and width-adjustable arms for upper body support. Warranted for users up to 300 lbs. The unique ilira-Stretch Mesh material moves in four directions to provide responsive, multidirectional support for your lumbar. The soft nature of the ilira-stretch envelops you in hammock-like comfort, while providing the right level of support throughout the day.